EP0985422A2 - Humidity and bacterial protection for medical components - Google Patents

Humidity and bacterial protection for medical components Download PDF

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Publication number
EP0985422A2
EP0985422A2 EP99116227A EP99116227A EP0985422A2 EP 0985422 A2 EP0985422 A2 EP 0985422A2 EP 99116227 A EP99116227 A EP 99116227A EP 99116227 A EP99116227 A EP 99116227A EP 0985422 A2 EP0985422 A2 EP 0985422A2
Authority
EP
European Patent Office
Prior art keywords
carrier
measuring tube
moisture
ventilator
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99116227A
Other languages
German (de)
French (fr)
Other versions
EP0985422A3 (en
EP0985422B1 (en
Inventor
Göran Skog
Lars Wallén
Carl-Erik Arvidsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maquet Critical Care AB
Original Assignee
Siemens Elema AB
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Filing date
Publication date
Application filed by Siemens Elema AB filed Critical Siemens Elema AB
Publication of EP0985422A2 publication Critical patent/EP0985422A2/en
Publication of EP0985422A3 publication Critical patent/EP0985422A3/en
Application granted granted Critical
Publication of EP0985422B1 publication Critical patent/EP0985422B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0816—Joints or connectors
    • A61M16/0841—Joints or connectors for sampling
    • A61M16/085—Gas sampling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0816—Joints or connectors
    • A61M16/0841—Joints or connectors for sampling
    • A61M16/0858—Pressure sampling ports
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/1055—Filters bacterial
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/106—Filters in a path
    • A61M16/1065—Filters in a path in the expiratory path
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical
    • A61M2016/0042—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the expiratory circuit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/75—General characteristics of the apparatus with filters
    • A61M2205/7518—General characteristics of the apparatus with filters bacterial
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/75—General characteristics of the apparatus with filters
    • A61M2205/7536—General characteristics of the apparatus with filters allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/40—Respiratory characteristics
    • A61M2230/43—Composition of exhalation
    • A61M2230/432—Composition of exhalation partial CO2 pressure (P-CO2)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/40—Respiratory characteristics
    • A61M2230/43—Composition of exhalation
    • A61M2230/435—Composition of exhalation partial O2 pressure (P-O2)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/50—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/35—Respirators and register filters

Definitions

  • the invention relates to a moisture and bacteria barrier for medical components that follow to a measuring tube in the flow path of a ventilator is arranged, is attached.
  • a ventilator can be monitored and controlled, become a number with the help of medical components Parameters, preferably measured on the expiratory side.
  • the medical components are preferably in one Unit that is connected to the named measuring tube firmly arranged.
  • a moisture and bacteria barrier at the entrance of the measuring tube in the form of a filter that is made in a mouthpiece Plastic is arranged to attach. That way an autoclaving of the mostly sensitive medical Components are avoided.
  • the plastic mouthpiece and the filter are mostly made of a single-use material that discarded after each use and with a new one Mouthpiece with filter is replaced when a new patient arrives connected to the ventilator.
  • This disposable product brings relatively high costs for the hospital and is also a burden on the environment. Besides, that can Filters a certain flow resistance in the expiratory line entail. If the filter is a long time is used, it can become clogged, which is too high Brings flow resistance. This can turn into a lead to increased pressure in the lungs, which increases the risk for damage.
  • EP 0 841 083 has attempted to address this problem solve by here a procedure and an arrangement for function control of filters has been created in order optimize the usage time without risking the Patient gets problems.
  • the invention is based, a proportionate task simple and cheap interchangeable moisture and Maintain bacterial barrier for medical components which have no flow resistance in the flow paths of the ventilator caused.
  • this object is achieved by a carrier, on the at least two moisture and bacteria barriers are attached so that one at a time in the Respirator applied carrier exactly in front of each component is arranged.
  • a is at the entrance of the measuring tube Filters avoided with the disadvantages of this application brings with it.
  • the invention allows everyone to follow the measuring tube applied a medical component individually get adapted barrier.
  • the barriers can Required close to the component or at a distance from the component be applied. Because the barriers on one common carriers are applied, they can if necessary can be replaced quickly and easily. Because a carrier of this Kind in construction is relatively simple, the manufacturing cost be kept low.
  • the membranes are arranged at a distance from the ultrasound transmission and reception heads. So that the ultrasonic signals reach the sending or receiving unit the signals must first cross the membrane and then pass a relatively large air gap. This Transition from a membrane to a relatively large one Air gap can lead to high acoustic impedance, i.e. lead to a high sound wave reflection. This can be too cause relatively large acoustic losses, so that an unacceptably low sound signal the transmission or Receiving heads reached.
  • the solution to this problem is i.a. the membrane close to the ultrasound transmit and receive heads to attach. With such a solution, which in the unpublished Swedish patent application 9801007 has been described, the membranes are no longer attached to a sterile insert tube, but are attached directly to the transmit and receive heads.
  • the carrier according to the invention is between attachable to the measuring tube and the unit. By placement the wearer can close the barriers mentioned at Bearf be attached to a component.
  • the carrier preferably has an elongated shape.
  • the cross-sectional profile of the Carrier is preferably on the outer profile of the measuring tube customized.
  • the carrier is preferably made of a plastic material manufactured.
  • peripheral surface of the carrier with a seal is provided with an applied carrier is against the measuring tube. This ensures that no gas seeps out of the measuring tube.
  • the supports are filters and / or membranes.
  • the carrier according to the invention is preferred interchangeable. This allows each new patient a new carrier will be attached.
  • FIG. 1 shows a ventilator 1 on which a Patient 2 is connected to thus supplied breathing gas to get.
  • the gases that together form the breathing gas the fan 1 via gas connections 3, 4 and 5 fed.
  • the breathing gas is released over a
  • the inspiration line 6 is fed to the patient 2.
  • the Exhalation is the breathing gas from patient 2 through a Expiration line 7 and via the ventilator 1 in the Environment, mostly to a collection container, not shown here, guided.
  • the expiration line 7 there is a measuring tube 8 arranged with a unit 9, including medical Components.
  • FIG. 2 is the measuring tube 8 and the unit 9 in one Comparison to FIG. 1 larger scale shown.
  • the medical Components are fixed in the unit 9.
  • the unit 9 comprises a pressure sensor 10, an ultrasonic flow meter 11, a carbon dioxide meter 12, an oxygen sensor 13 and a temperature meter 14.
  • the components are in a line one after the other arranged.
  • Components 10 through 14 are with the interior of the measuring tube 8 through openings 15 to 19 in the wall of the Measuring tube 8 connected.
  • the barriers are on a common support 20, e.g.
  • the barrier to the pressure transmitter 10 is a Bacteria filter 21, for the ultrasonic flow meter 11 foils 22, which are preferably close to the measuring heads 23 for the carbon dioxide meter 12 a window for the oxygen sensor 13 a transparent film 25 and for the temperature meter 14 a metal foil 26.
  • the unit When replacing the carrier 20, the unit is preferably 9 removed from the measuring tube 8. Then the carrier 9 with it Barriers 21, 22, 24, 25, 26 removed from the measuring tube 8 and against replaced a new carrier 20 suitable for the purpose. Then the unit 9 with the medical components 10 to 14 applied again in place.
  • the peripheral surface of the carrier 20 is preferably with a seal 27 provided that against an applied carrier 20 against Measuring tube 8 is applied.
  • the seal 27 is intended to prevent gas oozed out of the measuring tube.
  • sealing rings are also arranged around the openings 15 to 19. In this FIG. only has a sealing ring Reference numeral 28, namely for the opening 15, received.
  • FIG. 3 which is a top view of the carrier 20, shows that the barriers 21, 22, 24, 25, 26 in a row one after the other are arranged.
  • the seal 27 shown along the peripheral surface of the carrier 20th is arranged.
  • the essentials is a replaceable carrier according to the invention with moisture and bacteria barriers to get that way are arranged that each applied to a ventilator Carrier, arranged exactly in front of each component is.
  • the barriers can be applied by the carrier preferably between the measuring tube and the unit if necessary attached to the respective medical component become.
  • the invention prevents a flow resistance in the ventilator's expiratory flow path.
  • Another significant advantage of the invention is that the bearer common for the barriers, the barrier for all medical components in a simple manner at the same time can be exchanged.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Emergency Medicine (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

In a breathing appts., a measurement tube (8) is in the flow path of the exhaled air linked to a number of monitors. A carrier (20) has at least two barriers (21,22,24,25,26) against moisture and bacteria as filters and/or membranes. The carrier (20) is between the tube (8) and the monitoring assembly (9) which contains a pressure monitor (10), ultrasonic flow meter (11), carbon dioxide meter (12), oxygen sensor (13) and a temp. monitor (14).

Description

Die Erfindung bezieht sich auf eine Feuchtigkeits- und Bakterienbarriere für medizinische Komponenten, die im Anschluß an ein Meßrohr, das in den Flußwegen eines Beatmungsgerätes angeordnet ist, angebracht ist.The invention relates to a moisture and bacteria barrier for medical components that follow to a measuring tube in the flow path of a ventilator is arranged, is attached.

Damit ein Beatmungsgerät überwacht und gesteuert werden kann, werden mit Hilfe von medizinischen Komponenten eine Anzahl Parameter, vorzugsweise an der Exspirationsseite, gemessen. Die medizinischen Komponenten sind vorzugsweise in einer Einheit, die an dem genannten Meßrohr angeschlossen wird, fest angeordnet. Um die medizinischen Komponenten von "Verunreinigungen" in der Atmungsluft wie Arztneimitteln und Körperflüssigkeiten zu schützen, ist es bekannt, im Anschluß am Eingang des Meßrohres eine Feuchtigkeits- und Bakterienbarriere in Form eines Filters, das in einem Mundstück aus Kunststoff angeordnet ist, anzubringen. Auf diese Weise kann ein Autoklavieren der meistens empfindlichen medizinischen Komponenten vermieden werden. Das Mundstück aus Kunststoff und das Filter sind meistens aus einem Einwegmaterial, das nach jeder Verwendung verworfen wird und mit einem neuen Mundstück mit Filter ersetzt wird, wenn ein neuer Patient an dem Beatmungsgerät angeschlossen wird. Dieses Einwegprodukt bringt für das Krankenhaus relativ große Kosten mitsich und ist außerdem eine Belastung für die Umwelt. Außerdem kann das Filter einen gewissen Flußwiderstand in der Exspirationsleitung mitsichbringen. Wenn das Filter eine längere Zeit benutzt wird, kann es verstopft werden, was einen zu hohen Flußwiderstand mitsichbringt. Dies kann wiederum zu einem erhöhten Druck in der Lunge führen, was ein erhöhtes Risiko für Schäden mitsichbringt. So that a ventilator can be monitored and controlled, become a number with the help of medical components Parameters, preferably measured on the expiratory side. The medical components are preferably in one Unit that is connected to the named measuring tube firmly arranged. To the medical components of "contaminants" in the air we breathe like medicinal products and It is known to protect body fluids afterwards a moisture and bacteria barrier at the entrance of the measuring tube in the form of a filter that is made in a mouthpiece Plastic is arranged to attach. That way an autoclaving of the mostly sensitive medical Components are avoided. The plastic mouthpiece and the filter are mostly made of a single-use material that discarded after each use and with a new one Mouthpiece with filter is replaced when a new patient arrives connected to the ventilator. This disposable product brings relatively high costs for the hospital and is also a burden on the environment. Besides, that can Filters a certain flow resistance in the expiratory line entail. If the filter is a long time is used, it can become clogged, which is too high Brings flow resistance. This can turn into a lead to increased pressure in the lungs, which increases the risk for damage.

In der EP 0 841 083 ist versucht worden, dieses Problem zu lösen, indem hier ein Verfahren und eine Anordnung zur Funktionskontrolle von Filtern geschaffen worden ist, um somit die Benutzungszeit zu optimieren, ohne zu riskieren, daß der Patient Probleme bekommt.EP 0 841 083 has attempted to address this problem solve by here a procedure and an arrangement for function control of filters has been created in order optimize the usage time without risking the Patient gets problems.

Der Erfindung liegt die Aufgabe zugrunde, eine verhältnismäßig einfache und billige austauschbare Feuchtigkeits- und Bakterienbarriere für medizinische Komponenten zu erhalten, die keinen Flußwiderstand in den Flußwegen des Beatmungsgerätes verursacht.The invention is based, a proportionate task simple and cheap interchangeable moisture and Maintain bacterial barrier for medical components which have no flow resistance in the flow paths of the ventilator caused.

Diese Aufgabe ist erfindungsgemäß durch einen Träger gelöst, auf dem mindestens zwei Feuchtigkeits- und Bakterienbarrieren derart angebracht sind, daß jeweils eine, bei einem in dem Beatmungsgerät applizierten Träger genau vor jeder Komponente angeordnet ist. Hierdurch wird am Eingang des Meßrohres ein Filter vermieden mit den Nachteilen, die diese Applizierung mitsichbringt. Durch die Erfindung kann jede im Anschluß an das Meßrohr applizierte medizinische Komponente eine individuell angepaßte Barriere erhalten. Die Barrieren können bei Bedarf dicht an der Komponente oder mit Abstand zur Komponente appliziert werden. Dadurch, daß die Barrieren an einem gemeinsamen Träger appliziert sind, können sie bei Bedarf rasch und einfach ausgewechselt werden. Da ein Träger dieser Art im Aufbau verhältnismäßig einfach ist, können die Herstellungskosten niedrig gehalten werden.According to the invention, this object is achieved by a carrier, on the at least two moisture and bacteria barriers are attached so that one at a time in the Respirator applied carrier exactly in front of each component is arranged. As a result, a is at the entrance of the measuring tube Filters avoided with the disadvantages of this application brings with it. The invention allows everyone to follow the measuring tube applied a medical component individually get adapted barrier. The barriers can Required close to the component or at a distance from the component be applied. Because the barriers on one common carriers are applied, they can if necessary can be replaced quickly and easily. Because a carrier of this Kind in construction is relatively simple, the manufacturing cost be kept low.

In der US-PS 5 419 326 ist ein Ultraschallflußmesser beschrieben, in dem der Sender und der Empfänger mit Abstand voneinander entlang einer Meßstrecke, die schräg im Vergleich zur Achse einer rohrförmigen Meßkammer verläuft, angeordnet sind. Um dabei die Hygiene sicherzustellen, wird in Verbindung mit jedem neuen Patienten ein steriles Einsatzrohr in die Meßkammer eingeführt. Das sterile Rohr ist mit Meßfenstern versehen, die so angepaßt sind, daß sie über den Öffnungen in der Meßkammer liegen. In den Meßfenstern sind Membranen angeordnet, die für Ultraschallsignale durchlässig, aber für Feuchtigkeit und Bakterien undurchlässig sind, so daß die Ultraschallsignale entlang der Meßstrecke durch das sterile Einsatzrohr passieren können. Hierdurch wird vermieden, daß das Krankenhauspersonal nach jeder Verwendung den Flußmesser autoklavieren muß, da insbesondere die Ultraschallsende- und Empfangseinheit empfindliche Teile in dem Flußmesser sind. Die Membranen sind mit Abstand zu den Ultraschallsende- und Empfangsköpfen angeordnet. Damit die Ultraschallsignale die Sende- bzw. Empfangseinheit erreichen können, müssen die Signale zunächst die Membran und danach einen verhältnismäßig großen Luftspalt passieren. Dieser Übergang von einer Membran zu einem verhältnismäßig großen Luftspalt kann zu einer hohen akustischen Impedanz, d.h. einer hohen Schallwellenreflexion führen. Dies kann zu verhältnismäßig großen akustischen Verlusten führen, so daß ein nicht annehmbar niedriges Schallsignal die Sende- bzw. Empfangsköpfe erreicht. Die Lösung dieses Problems ist es, u.a. die Membran dicht an den Ultraschallsende- und Empfangsköpfen anzubringen. Bei einer solchen Lösung, die in der noch nicht veröffentlichten schwedischen Patentanmeldung 9801007 beschrieben worden ist, sind die Membranen nicht mehr an einem sterilen Einsatzrohr angebracht, sondern werden direkt an den Sende- und Empfangsköpfen befestigt.An ultrasonic flow meter is described in US Pat. No. 5,419,326. in which the transmitter and the receiver are at a distance from each other along a measurement section that is obliquely compared runs to the axis of a tubular measuring chamber, arranged are. In order to ensure the hygiene, in connection with every new patient a sterile insert tube in introduced the measuring chamber. The sterile tube is with measuring windows provided that are adapted so that they over the openings lie in the measuring chamber. There are membranes in the measuring windows arranged that are permeable to ultrasound signals, but are impervious to moisture and bacteria, so that the ultrasonic signals along the measurement path through the sterile insert tube can pass. This avoids that hospital staff use the Flow meter must be autoclaved, since the ultrasonic transmitter and receiver unit in particular has sensitive parts in the Are flow meters. The membranes are arranged at a distance from the ultrasound transmission and reception heads. So that the ultrasonic signals reach the sending or receiving unit the signals must first cross the membrane and then pass a relatively large air gap. This Transition from a membrane to a relatively large one Air gap can lead to high acoustic impedance, i.e. lead to a high sound wave reflection. This can be too cause relatively large acoustic losses, so that an unacceptably low sound signal the transmission or Receiving heads reached. The solution to this problem is i.a. the membrane close to the ultrasound transmit and receive heads to attach. With such a solution, which in the unpublished Swedish patent application 9801007 has been described, the membranes are no longer attached to a sterile insert tube, but are attached directly to the transmit and receive heads.

Es gibt andere medizinische Komponenten mit den Forderungen, daß die Membran oder das Filter dicht an der jeweiligen Komponente angebracht werden soll, damit das bestmögliche Meßergebnis erhalten wird. Da der Träger für die Barriere beim Gegenstand der US-Schrift in die Meßkammer einschiebbar und placierbar ist, kann es aufgrund der Wandstärke der Meßkammer schwierig sein, die Barriere dicht an einer medizinischen Komponente anzubringen. In der US-Schrift sind zwar zwei Barrieren am sterilen Rohr angebracht, aber diese zwei Barrieren sind lediglich für eine einzige medizinische Komponente vorgesehen. There are other medical components with the requirements that the membrane or the filter close to the respective component should be attached so that the best possible measurement result is obtained. Since the carrier for the barrier at Object of the US document insertable into the measuring chamber and is placeable, it can be due to the wall thickness of the measuring chamber be difficult to close the barrier to a medical Attach component. There are two in the US script Barriers attached to the sterile tube, but these two barriers are only for a single medical component intended.

Bei einem Beatmungsgerät mit einem Meßrohr und einer Einheit der eingangs genannten Art, in der fest montierte Komponenten angeordnet sind, ist der Träger nach der Erfindung zwischen dem Meßrohr und der Einheit anbringbar. Durch die Placierung des Trägers können bei Bearf die genannten Barrieren dicht an einer Komponente angebracht werden.In a ventilator with a measuring tube and a unit of the type mentioned, in the fixed components are arranged, the carrier according to the invention is between attachable to the measuring tube and the unit. By placement the wearer can close the barriers mentioned at Bearf be attached to a component.

Da die Komponenten in der Einheit in der Regel in einer Reihe nacheinander angeordnet sind, weist der Träger vorzugsweise eine langgestreckte Form auf. Das Querschnittprofil des Trägers ist vorzugsweise an das Außenprofil des Meßrohres angepaßt. Der Träger ist vorzugsweise aus einem Kunststoffmaterial hergestellt.Because the components in the unit are usually in a row are arranged one after the other, the carrier preferably has an elongated shape. The cross-sectional profile of the Carrier is preferably on the outer profile of the measuring tube customized. The carrier is preferably made of a plastic material manufactured.

In einer vorteilhaften Weiterentwicklung der Erfindung wird vorgeschlagen, daß die Peripherieoberfläche des Trägers mit einer Dichtung versehen ist, die bei einem applizierten Träger gegen das Meßrohr anliegbar ist. Hierdurch wird sichergestellt, daß kein Gas aus dem Meßrohr heraussickert.In an advantageous further development of the invention suggested that the peripheral surface of the carrier with a seal is provided with an applied carrier is against the measuring tube. This ensures that no gas seeps out of the measuring tube.

Die Träger sind nach der Erfindung Filter und/oder Membranen.According to the invention, the supports are filters and / or membranes.

Wie bereits erwähnt, ist der Träger nach der Erfindung vorzugsweise austauschbar. Hierdurch kann vor jedem neuen Patienten ein neuer Träger angebracht werden.As already mentioned, the carrier according to the invention is preferred interchangeable. This allows each new patient a new carrier will be attached.

Die Erfindung ist nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

FIG. 1
ein schematsich gezeichnetes Beatmungsgerät mit einem Meßrohr und einer Einheit für medizinische Komponenten, die im Anschluß an der Exspirationsleitung angeordnet sind,
FIG. 2
ein Meßrohr in einem Längsschnitt, eine Einheit mit schematisch gezeichneten medizinischen Komponenten und dazwischen einen Träger für Feuchtigkeits- und Bakterienbarriere nach der Erfindung und
FIG. 3
einen Träger nach FIG. 2 in einer Draufsicht.
The invention is explained in more detail below with reference to an embodiment shown in the drawings. Show it:
FIG. 1
2 shows a schematically drawn ventilator with a measuring tube and a unit for medical components which are arranged in the connection to the expiration line,
FIG. 2nd
a measuring tube in a longitudinal section, a unit with schematically drawn medical components and in between a support for moisture and bacteria barrier according to the invention and
FIG. 3rd
a carrier according to FIG. 2 in a top view.

In der FIG. 1 ist ein Beatmungsgerät 1 gezeigt, an dem ein Patient 2 angeschlossen ist, um somit Atmungsgas zugeführt zu bekommen. Diejenigen Gase, die zusammen das Atmungsgas bilden, werden dem Ventilator 1 über Gasanschlüsse 3, 4 und 5 zugeführt. Bei der Einatmung wird das Atmungsgas über eine Inspirationsleitung 6 dem Patienten 2 zugeleitet. Bei der Ausatmung wird das Atmungsgas vom Patienten 2 durch eine Exspirationsleitung 7 und über das Beatmungsgerät 1 in die Umgebung, meistens an einen hier nicht gezeigten Sammelbehälter, geführt. In der Exspirationsleitung 7 ist ein Meßrohr 8 angeordnet, das mit einer Einheit 9, beinhaltend medizinische Komponenten, verbunden ist.In FIG. 1 shows a ventilator 1 on which a Patient 2 is connected to thus supplied breathing gas to get. The gases that together form the breathing gas the fan 1 via gas connections 3, 4 and 5 fed. When inhaled, the breathing gas is released over a The inspiration line 6 is fed to the patient 2. In the Exhalation is the breathing gas from patient 2 through a Expiration line 7 and via the ventilator 1 in the Environment, mostly to a collection container, not shown here, guided. In the expiration line 7 there is a measuring tube 8 arranged with a unit 9, including medical Components.

In der FIG. 2 ist das Meßrohr 8 und die Einheit 9 in einem im Vergleich zur FIG. 1 größeren Maßstab gezeigt. Die medizinischen Komponenten sind in der Einheit 9 fest angeordnet. In diesem Ausführungsbeispiel umfaßt die Einheit 9 einen Druckgeber 10, einen Ultraschallflußmesser 11, einen Kohlendioxydmesser 12, einen Sauerstoffsensor 13 und einen Temperaturmesser 14. Die Komponenten sind in einer Linie nacheinander angeordnet. Die Komponenten 10 bis 14 sind mit dem Inneren des Meßrohres 8 über Öffnungen 15 bis 19 in der Wand des Meßrohres 8 verbunden. Um zu vermeiden, daß die Komponenten 10 bis 14 durch die "verunreinigte" Ausatmungsluft kontaminiert werden, sind zwischen dem Meßrohr 8 und den Komponenten 10 bis 14 Feuchtigkeits- und Bakterienbarrieren angeordnet. Die Barrieren sind auf einem gemeinsamen Träger 20, z.B. in Form einer Scheibe aus Kunststoff, derart angebracht, daß jede Barriere genau vor jeweils einer Komponente 10 bis 14 angeordnet ist. So ist die Barriere für den Druckgeber 10 ein Bakterienfilter 21, für den Ultraschallflußmesser 11 Folien 22, die vorzugsweise dicht an den Meßköpfen 23 anliegen, für den Kohlendioxydmesser 12 ein Fenster, für den Sauerstoffsensor 13 eine transparente Folie 25 und für den Temperaturmesser 14 eine Metallfolie 26.In FIG. 2 is the measuring tube 8 and the unit 9 in one Comparison to FIG. 1 larger scale shown. The medical Components are fixed in the unit 9. In In this embodiment, the unit 9 comprises a pressure sensor 10, an ultrasonic flow meter 11, a carbon dioxide meter 12, an oxygen sensor 13 and a temperature meter 14. The components are in a line one after the other arranged. Components 10 through 14 are with the interior of the measuring tube 8 through openings 15 to 19 in the wall of the Measuring tube 8 connected. To avoid the components 10 to 14 contaminated by the "contaminated" exhaled air are between the measuring tube 8 and the components 10 to 14 moisture and bacteria barriers arranged. The barriers are on a common support 20, e.g. in Form of a disc made of plastic, attached such that each barrier exactly in front of a component 10 to 14 is arranged. So the barrier to the pressure transmitter 10 is a Bacteria filter 21, for the ultrasonic flow meter 11 foils 22, which are preferably close to the measuring heads 23 for the carbon dioxide meter 12 a window for the oxygen sensor 13 a transparent film 25 and for the temperature meter 14 a metal foil 26.

Beim Auswechseln des Trägers 20 wird vorzugsweise die Einheit 9 vom Meßrohr 8 entfernt. Danach wird der Träger 9 mit dessen Barrieren 21, 22, 24, 25, 26 vom Meßrohr 8 entfernt und gegen einen neuen für den Zweck passenden Träger 20 ausgewechselt. Danach wird die Einheit 9 mit den medizinischen Komponenten 10 bis 14 wieder an ihrem Platz appliziert. Die Peripherieoberfläche des Trägers 20 ist vorzugsweise mit einer Dichtung 27 versehen, die bei einem applizierten Träger 20 gegen das Meßrohr 8 anliegt. Die Dichtung 27 soll verhindern, daß Gas aus dem Meßrohr heraussickert. In diesem Ausführungsbeispiel sind auch Dichtungsringe um die Öffnungen 15 bis 19 angeordnet. In dieser FIG. hat lediglich ein Dichtungsring ein Bezugszeichen 28, und zwar für die Öffnung 15, erhalten.When replacing the carrier 20, the unit is preferably 9 removed from the measuring tube 8. Then the carrier 9 with it Barriers 21, 22, 24, 25, 26 removed from the measuring tube 8 and against replaced a new carrier 20 suitable for the purpose. Then the unit 9 with the medical components 10 to 14 applied again in place. The peripheral surface of the carrier 20 is preferably with a seal 27 provided that against an applied carrier 20 against Measuring tube 8 is applied. The seal 27 is intended to prevent gas oozed out of the measuring tube. In this embodiment sealing rings are also arranged around the openings 15 to 19. In this FIG. only has a sealing ring Reference numeral 28, namely for the opening 15, received.

FIG. 3, die eine Draufsicht des Trägers 20 ist, zeigt, daß die Barrieren 21, 22, 24, 25, 26 in einer Reihe nacheinander angeordnet sind. In der FIG. ist auch die Dichtung 27 gezeigt, die entlang der Peripherieoberfläche des Trägers 20 angeordnet ist.FIG. 3, which is a top view of the carrier 20, shows that the barriers 21, 22, 24, 25, 26 in a row one after the other are arranged. In FIG. is also the seal 27 shown along the peripheral surface of the carrier 20th is arranged.

Im Rahmen der Erfindung können selbstverständlich mehr oder weniger medizinische Komponenten als die hier erwähnten, in der Einheit appliziert werden. Es ist ferner selbstverständlich nicht notwendig, daß diese in einer Reihe nacheinander angeordnet sein müssen, wie das Beispiel es zeigt. Das Wesentliche ist, einen austauschbaren Träger nach der Erfindung mit Feuchtigkeits- und Bakterienbarrieren zu erhalten, die so angeordnet sind, daß jede, bei einem am Beatmungsgerät applizierten Träger, genau vor jeweils einer Komponente angeordnet ist. Die Barrieren können durch die Applizierung des Trägers zwischen dem Meßrohr und der Einheit bei Bedarf vorzugsweise dicht an der jeweiligen medizinischen Komponente angebracht werden. Of course, more or fewer medical components than those mentioned here be applied to the unit. It goes without saying not necessary that these are in a row one after the other must be arranged, as the example shows. The essentials is a replaceable carrier according to the invention with moisture and bacteria barriers to get that way are arranged that each applied to a ventilator Carrier, arranged exactly in front of each component is. The barriers can be applied by the carrier preferably between the measuring tube and the unit if necessary attached to the respective medical component become.

Durch die Erfindung wird vermieden, daß ein Flußwiderstand in dem Exspirationsflußweg des Beatmungsgerätes entsteht. Ein weiterer wesentlicher Vorteil der Erfindung ist es, daß durch den für die Barrieren gemeinsamen Träger, die Barriere für sämtliche medizinische Komponenten auf einfache Weise gleichzeitig ausgetauscht werden können.The invention prevents a flow resistance in the ventilator's expiratory flow path. On Another significant advantage of the invention is that the bearer common for the barriers, the barrier for all medical components in a simple manner at the same time can be exchanged.

Claims (6)

Feuchtigkeits- und Bakterienbarriere (21, 22, 24, 25, 26) für medizinische Komponenten (10 bis 14), die im Anschluß an ein Meßrohr (8), das in den Flußwegen eines Beatmungsgerätes (1) angeordnet ist, angebracht ist, gekennzeichnet durch einen Träger (20), auf dem mindestens zwei Feuchtigkeits- und Bakterienbarrieren (21, 22, 24, 25, 26) derart angebracht sind, daß jeweils eine, bei einem in dem Beatmungsgerät (1) applizierten Träger (20) genau vor jeder Komponente (10 bis 14) angeordnet ist.Moisture and bacteria barrier (21, 22, 24, 25, 26) for medical components (10 to 14), which is attached to a measuring tube (8), which is arranged in the flow paths of a ventilator (1), marked by a carrier (20) on which at least two moisture and bacterial barriers (21, 22, 24, 25, 26) are attached in such a way that in each case one carrier (20) applied to the ventilator (1) is in front of each Component (10 to 14) is arranged. Feuchtigkeits- und Bakterienbarriere nach Anspruch 1, dadurch gekennzeichnet, daß der Träger (20) eine langgestreckte Form aufweist.Moisture and bacteria barrier according to claim 1, characterized in that the carrier (20) has an elongated shape. Feuchtigkeits- und Bakterienbarriere nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Peripherieoberfläche des Trägers (20) mit einer Dichtung (27) versehen ist, die bei einem applizierten Träger (20) gegen das Meßrohr (8) anliegt.Moisture and bacteria barrier according to claim 1 or 2, characterized in that the peripheral surface of the carrier (20) is provided with a seal (27) which bears against the measuring tube (8) in the case of an applied carrier (20). Feuchtigkeits- und Bakterienbarriere nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Träger (21, 22, 24, 25, 26) Filter und/oder Membranen sind.Moisture and bacteria barrier according to one of claims 1 to 3, characterized in that the supports (21, 22, 24, 25, 26) are filters and / or membranes. Beatmungsgerät (1) umfassend ein Meßrohr (8) und eine Einheit (9), in denen fest montierte Komponenten (10 bis 14) angeordnet sind, wobei ein Träger (20) nach einem der Ansprüche 1 bis 4 zwischen dem Meßrohr (8) und der Einheit (9) anbringbar ist.Ventilator (1) comprising a measuring tube (8) and one Unit (9) in which fixed components (10 to 14) are arranged, wherein a carrier (20) after a of claims 1 to 4 between the measuring tube (8) and the Unit (9) can be attached. Beatmungsgerät nach Anspruch 5, dadurch gekennzeichnet, daß der Träger (20) austauschbar ist.Ventilator according to claim 5, characterized in that the carrier (20) is interchangeable.
EP99116227A 1998-09-09 1999-08-17 Humidity and bacterial protection for medical components Expired - Lifetime EP0985422B1 (en)

Applications Claiming Priority (2)

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SE9803047 1998-09-09
SE9803047A SE9803047D0 (en) 1998-09-09 1998-09-09 Moisture and bacterial barrier for medical components

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EP0985422A3 EP0985422A3 (en) 2000-12-06
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JP2000084080A (en) 2000-03-28
JP4194720B2 (en) 2008-12-10
EP0985422A3 (en) 2000-12-06
US6397846B1 (en) 2002-06-04
EP0985422B1 (en) 2007-08-01
DE59914430D1 (en) 2007-09-13
SE9803047D0 (en) 1998-09-09

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